Drilling-machine



(No Model.)

PSGHOFP.

DRILLING MACHINE.

ffwnol' redem Schw N-iTn STATES PATENT Grricn.

FREDERIC SCI-IOFF, OF PHILADELPHIA, PEIINSYLANIA.`

DRlLLlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 397,311, dated February5, 1889.`

Application tiled October 27, 1888.` Serial No. 289,277.' (No model.)

To @ZZ whom t may concern:

Be it known that I, FREDERIC ScHoFF, a citizen of the United States, anda resident of Philadelphia, Pennsylvania, have invented certainImprovements in Drilling-liachines, of which the following is aspecification.

The object ot my invention is to construct a simple and handydrilliiig-machine for boring or tapping the set-screw holes and oilholesin pulleys.

The machine which I will now proceed to describe is to be used as aportable drillingmachine in connection with a flexible drivin gsha'ft;but it will be evident that the machine canV be either permanent orportable, and driven by belting in the usual manner.

In the accompanying .lrawings, Figure l is a perspective view ot myimproved drillingmachinc. Fig. 2 is a vertical seelion.- Fig. 3 is atransverse section on the line l 2, Fig. 2; and Fig. l is a sect-ion onthe line 3 l, Fig. 2.

A is a standard or l'rame having a sleeve, d, which is adapted to passover a hollow mandrel, Il. In this mandrel is a screw, C, and adapted tothe threads of the screw is a nut, E, this nut beingV secured to thecollar d ol' the standard A by a nut, e, adapted to the threaded portione ol' the nut. The screw C is journaled in the inner end of the mandrelB and at the outer end in a cap, B', screwed upon the mandrel, the capbeing conlined to the screw by a fixed collar, c, and a movable collar,c. The screw-shaft is provided with a suitable handle, C', by which thescrew is turned and the standard A moved upon the mandrel.

Forming part of the mandrel Bin the present instance is a screw-threadedstem, b, adapted to the threads on which is a thumbnut, b. On this stemb is a flange, f, a collar, f, and a con e, f2. The collarf, I make ofthe same diameter as that of the bore ot the pulley, and I slip thepulley into position, as shown by dotted lines in Fig. 2, then the cone,and then screw up the thumb-screw b until the pulley is iirmly held inposition upony the stem if; but it will be noticed that a space is leftbetween the sleeve f and the cone f2, so that the drill or tap,described hereinafter, can pass through the hub of the pulley and maltea clean hole without inj uring any Aportion of the machine or the drillor taps.

On the standard A slides a carriage, D, carrying the drilling mechanism,said carriage being adapted to undercut ways d in thestandard A.Portions d of this carriage bear against the sides of the standard A, soas to insure perfect steadiness in the travel of the carriage. Thecarriage is raised and lowered by means ot' a screw, G, journaled in thestandard A and provided at its upper end with a handle, G.

Adapted to the threads ot the screw G is a nut, H, which passes througha slot, h, Fig. 2, in the rear of the standard A, and .into a T- wayinthe carriage D, the shank 71Fig. at, of the nut being T-headed tocorrespond with this way. A set-screw, h2, bears against the shank ol.the nut, preventing its moving independent ol' the carriage; but when itis desired to release the carriage from the control ot' the nut theset-screw is turned out of engagement with the shank 71. of the nut.

The vertical screw-shaft feeds the carriage radially toward and 'fromthe hub of the pulley, so that by turning the screw-shaft C in onedirection the drill will be' moved toward the pulley, and by turning thescrew-shaft G the drill will be fed radially toward the hub ot' thepulley.

The gearing tor driving the drill is constructed in the followingmanner: The driv-` ing-spindle L has its bearings in the extension Z onthe carriage D, and to this spindle is attached the flexibledriving-shaft, or, where driving-shafts are not used, a pulley may besecured to this spindle. On the inner end of the spindle is a bevelgear-wheel, 2, as shown in Fig. 4, engaging with a bevel gear-wheel, 3,on a vertical spindle, 4., having its bearings in the upper and lowercasing of the carriage. On the vertical shaft -i is a pinion, 5,engaging with a pinion, G, this pinion in turn engaging with a pinion,7, and the pinion 7 engaging with a pinion, S. viall these pinions havetheir bearings in the upper and lower frames of the carriage. The lowerframe in this instance is detachable, so that on removing said lowerframe all the gearing can be removed for repairs. The orice in thepinion 8, I prefer to make tapered, so as to fit the IOO shank of theordinary twist-drill, which is shown in position on said pinion. Thus itwillbe seen that this portable pulley-hubdrilling machine can be appliedto a pulley in any position on the bench or ioor, depending' upon itssize, and can be attached to said pulley very quickly and be in positionto bore the necessary set-screw holes or oilholes, as the ease may be,without the necessity ot' the tedious oi'ieratiou of securing' Thepulley in a certain position, boring; not only through theI hub olf thepulley, but also, in most eases, through the rim of thewhccl, thuswealtcninI it to a certain degree.

The machine will take in a number oli' sizes of pulleys, and by thelsimple adjustment of the two screw-shafts C and G, l `ani enabled toaccommodale the mach inc todif'l'erent sizes oli' pulleys. y

A suitable tapping-tool is provided, and when ,itis required to tap theorifice after drilling' l uncouple the carriage from the nut H byunscrewing' the set-screw 712, so that: it will. be free from thefeed-screw G, and when the tap is started it feeds itself into theorifice, and by uncoupling' the'f'lexible shaft (shown by dotted linesin Fig. l) the tap can be reversed by hand by applying' a suitablehandle or wrench to the end of. the driving-shaft L.

The eonej"J is adapted to fit into the bore of a number ofditt'erent-sized pulleys; but the sleeve or collarf, I prefer to make tofit the diiierent sizes, so as to have a iirnl bearing,I as nearly aspossible under the drill. Theilange fta-kes the thrust of the pulley,and, beil'lg'accurately made, will insure the drilling' of the hole inthe proper line.

I claim my inventionp Il. The combi n ati on, in a pulleyhuli-drillingmachine, of the mandrel B, adapted to be secured to thehub of thepulley, and a screw-shaft Vin said maniflrcl, with a standard, A,carrying` the drillscarriag'e, and a nut detachably sccured to saidstainlard and meshing` with the threads on. the screw, substantially asdescribed.

The (ombination ot' the mandrel carrying the drillinfr mechanism,havingl a screw-spindle, Z), and a nut thereon, lwith a cone-sleeve onsaid spindle and acting' with the mandrel to clam p the hul) ol' thepulley to the frame, substantiall y as described.

1'). The combination ot' the mandrel l-, the screw-shaft (l, sliding'standard A, havingl a nut engaging' with the screw-shaft (f, saidstandard having' guideways, and a carriage aijlapteil to said guidewaysand provided with a nut, with a Vertical screw-sllait/in said stand ardengagingl with the nut, so that by turi'ling the shafts C and G thecarriage may be moved both from or toward the pulley and from or towardthe cent-e1' of the pulley, substantially as described.

4. The combination, Vin a drilling' and tapn pingx machine, of thestandard havin g a screw, an d a nui'I adapted to th e screw, with a drill-carriage adapted to be raised or lowered by said screw, and means forsecuring the carriage to and detaching,r it from the nut withoutdisturbing either lthe nut or the carriage, substantiall y as set forth.

The combination olf the standard A,scre\v shaft G, and a nut, Il,adapted to said screw, with a carriage, D, having, a T-slot in which theshank o'l' the nut l'I is confined, substantially as described.

In testimony whereof I have signed myname to this specication in thepresence ol" two subscribing' witnesses.

YVitnesses:

HENRY HowsoN, WILLIAM I), (JONNER.

